Spring-chuck.



L. M. WAITE.

SEEING CHUCK.

APPLIGATIONHLBD 2113.24, 191g.

1,125,780. Patented Jan. 19, 1915.

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i TED STAWENT orrrc.

LYMAN M. WAITE, 0F FITCHBURG, MASSACHUSETTS, ASSIGNOR TO FITCI-IBURG MACHINE WORKS, OF FITCI-IBURG, MASSACHUSETTS, B. CORPORATION OF MAS- SACI-IUSETTS.

SPRING-CHUCK.

Specification of Letters Patent.

Patented Jan. 19, 1915.

To all whom it may concern Be it known that I, LYMAN M. WAITE, a citizen of the United States, residing at Fitchburg, in the county of Worcester and State of Massachusetts, have invented a new and useful Spring-Chuck, of which the following is a specification.

This invention relates to a spring chuck which is particularly adapted for use on automatic lathes, screw machines, or other machines performing similar operations. These machines operate upon long bars of stock held in rotating spindles and adapted to be intermittently fed forward and gripped in successive operative positions. It is usually necessary to use the same machine to operate upon a large number of different sizes of stock and it is therefor essential that the gripping mechanism may be quickly and easily changed to adapt it to different sizes.

My invention accordingly relates to 1mproved devices by which the necessary changes in the chucks or gripping mechanism may be conveniently made.

A preferred form of my invention is shown in the drawings in which- Figure 1 is a longitudinal sectional view taken along theline 1-1 of Fig. 3; Figs. 2 and 3 are side and end elevations respectively of the spring sleeve constituting one element of the chuck, Figs. 4 and 5 are side and end elevations respectively, of the spring bushing constituting the other member of the chuck, and Figs. 6 and 7 are detail views showing an alternative method of preventing relative displacement of the parts.

The spring sleeve 10 is in most respects of the ordinary construction, having an abruptly tapered outer surface at its front end which fits within a correspondingly tapered hollow spindle nose 11. The hollow spindle nose 11 is of ordinary construction and any of the usual devices may be provided for forcing the chuck into the spindle to cause it to grip the work.

The spring sleeve 10 is also provided with a rearwardly extended projection '12. A substantially cylindrical hole extends from the rear end of the truck partially through the spring sleeve and merges at its front end into a tapered recess somewhat smaller in diameter than the cylindrical hole and slightly increasing in diameter toward its forward end.

The spring bushing 13 is proportioned to fit loosely within the spring sleeve, the front portion 14 of the bushing being slightly tapered to correspond to the taper on the inside of the spring sleeve, so that the bushing is slightly larger in diameter at its extreme front end. rIhe rear end of the bushing is provided with an annular projection 15 which fits loosely within the cylindrical hole in the spring sleeve and serves to keep the bushing in alinement with the sleeve.

The sleeve and bushing are each provided with a plurality of slots 16 which permit the parts to be forced inward to grip the material. It is sometimes desirable to prevent possible relative rotation between the bushing and the sleeve and in that event a key 17 may be provided which will lock the annular projection 15 within the portion 12 of the spring sleeve, preventing any relative rotation between these parts.

Instead of the key shown in Fig. 1 I may use a screw 17a as shown in Fig. 6, which has a pointed end extending into a slight recess or depression in the annular projection 15. The screw thus serves to prevent both longitudinal and angular displacement and when this arrangement is used the bearing surfaces between the sleeve and the bushing may be of the same diameter throughout as shown in Fig. 7, instead of having the slight taper above described.

The rear portion 18 of the bushing is counterbored to give the desired resiliency to the spring arms and the front portion 19 is formed to correspond to the particular size or shape of stock which is to be held in the chuck.

The slight taper on the inside of the sleeve and the outside of the bushing is merely suiiicient to prevent the bushing from being accidentally displaced rearwardly and serves to keep the parts in operative relation. The shoulder at the rear of the portion 14 of the bushing forms a stop to prevent displacement of the bushing in the other direction. When it is necessary to change from one size of stock to another, it is merely necessary to force the bushing rearwardly out of the sleeve and to substitute another bushing having a different diameter in the portion 19. This operation is quickly performed and there are no loose parts to be lost or displaced. Furthermore, it is unnecessary to form any openings in the front portion of the sleeve in order to retain the bushing or lining therein. This does away with one very serious objection to previous constructions in which it was customary to insert screws through the sleeve to hold each one of a series of separate lining members or pads within the front end of the sleeve. It will also be apparent that in my construction all parts of the spring bushing form a single integral structure which is held constantly in alinement with the spring sleeve by the tapered bearing surfaces at the front end and the annular projection at the other end. I thus avoid the damage often caused by the loosening and subsequent displacement of one or more of the lining members or pads above referred to.

Having thus described my invention, it will be evident that changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of my invention as defined by the claims and I do not wish to be limited to the details herein disclosed, but

lVhat I do claim is 1. A spring chuck comprising a sleeve having a continuous band at one end and a plurality of spring arms supported thereon, and a bushing also having a continuous band at one end and a plurality oi spring arms supported' thereon, said bushing being removably fitted within said sleeve and the two continuous bands the spring arms of the bushing being positioned within the spring arms of the sleeve and operable thereby, and the continuous band on the bushing being iitted within the continuous band of the sleeve and maintaining the bushing in concentric relation thereto.

2. A spring chuck comprising a sleeve having a plurality of spring arms and a bushing also having a plurality of spring arms and tting loosely within said sleeve, said parts having coperating bearing surfaces so disposed as to prevent accidental relative displacement of said sleeve and bushing.

3. A spring chuck having in combination a spring sleeve and a spring bushing, said sleeve having a slightly tapered bore at one end and said bushing having a correspondingly tapered bearing portion, the tapered portion in said bushing being inserted within the tapered bore of said sleeve from the smaller end thereof, said tapered surfaces coperating to prevent accidental displacement of said bushing.

4:. A spring chuck having in combination a spring sleeve and a spring bushing, said sleeve having a cylindrical opening extending from its rear end part way through the sleeve, the remaining portion of the opening in the sleeve tapering slightly outward toward the front end and said bushing having a correspondingly tapered portion fitting the front end of said sleeve and having an annular lportion loosely iitting the cylindrical opening at the rear of said sleeve.

5. Al spring chuck comprising a sleeve and a bushing, said sleeve having a plurality of spring arms each abruptly tapered on its exterior bearing portion and slightly tapered on its interior bearing portion, and said bushing having a plurality of spring arms each slightly tapered on its exterior bearing portion and substantially cylindrical on its interior bearing portion, the

slightly tapered portions of the sleeve and bushing coperating to holdV the bushing within the sleeve.

6. A spring chuck comprising a sleeve and a bushing, said sleeve having a plurality of spring arms each abruptly tapered on its exterior bearing portion and slightly tapered on its interior bearing portion, and said bushing having a plurality of spring arms each slightly tapered on its exterior bearing portion and substantially cylindrical on its interior bearing portion, the slightly tapered portions of the sleeve and bushing cooperating to hold the bushing within the sleeve, and additional means to prevent relative rotation between said sleeve and said bushing.

7. A spring chuck comprising a sleeve having a plurality of spring arms, a bushing also having a plurality of spring arms and fitting loosely in said sleeve, and means to prevent relative longitudinal and angular displacement of said sleeve and bushing.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing' witnesses.

LYMAN M. IVAITE l/Vitnesses:

CHAs. T. I-IAwLEY, C. Fonnns'r TvVEssoN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

Correction in Letters Patent No. 1,125,780n

Itis hereby certified that in Letters Patent No. 1,125,780, granted January 19,

1915, upon the application of Lyman M. Waite, of Fitchburg,

Massachusetts, for an improvement in Spring-Chucks an error appears in the printed specification requiring correction as follows: Page 2, lines 32-33, strike out the Words and the tWo continuous bands; and that the said Letters Patent should be read With this correction therein that the same may conform to the record of the oase in the Patent Oce.

Signed and sealed this 30th day of March, A. D., 1915.

[SEAL] J. T. NEWTON,

Acting Commissioner of Patents. 

